On 1963 VW Buses there were 2 different sized spindles. Earlier Buses have a larger diameter spindle and approx. half way through the year - VW switched to a smaller spindle. You will need to confirm which size spindle you have and order the correct drum. Small spindle used the VWC-211-405-615-AGR drum. Large spindle used the VWC-211-405-615-B drum.